Process of making mottled or variegated papers.



J. F. HERCHER.

PROCESS OF MAKING MOTTLED 0R VARIEGATED PAPERS. APPLICATION FILED AUG-1L1915.

1.. lPatentedApr. 18,1916. 7

2 SHEETS-SHEET 2- wi/tweooeo JOHN 1E. HERCHER, 01B NEENAH, SCUNSIN.

PROCESS OF MAKING- MOTTLED OR VARIEGATED PIERS.

TJLMMMW.

Specification of Letters Patent.

Application filed August 17, 1915. Serial No. 415,995,

Making Mottled or Variegated Papers, of

which the following is a specification.

This invention relates to a process of making mottled or variegatedpaper, and particularly to a process ofvlnaking paper of this kind uponpaper making machines a of the cylinder type.

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The object of the invention is to provide a process whereby mottled orvariegated paper may be made directly upon the screen mold of a cylindermachine in a simple manner, and at a cost exceeding slightly, if any,the cost of production of ordinary unmottled or unvariegated paper, andwithout the labor and expense of making mottled or variegated paperaccording to ordinary proccesses.

in the accompanying drawing;-Figure 1 is a longitudinal section througha portion of a cylinder paper making machine, showing one form ofmechanical means for carrying my process into practice. Fig. 2 is a topplan view of the same. Fig. 3 is a vertical section on an enlarged scalethrough thehopper or flow box and adjacent portions of the formingcylinder and couch roll, showing the relative arrangement of parts.

Referring to the drawing, 1 designates a paper making machine of thecylinder type, which maybe provided with any desired number or sets ofpaper making devices, each consisting of 'a vat 2, forming cylinder 3and couch roll 4:, together with the usual elements cooperatingtherewith. Tn this type of machine the pulp or stock is contained withwater ,in the vat 2, the stock or pulp being taken up in the form of athin layer by the wire surface of the formin screen or mold 3, the waterflowing from t e stock through the wire of the screen and being pumpedfrom the interior of the cylinder, producing a suction which causes thepaper to adhere to the surface of'the roll. The web of paper then comesin contact with the couch roll and is stripped from the forming cylinderand carried forward for the finishing operations in the usual way.

My method consists in supplying to the descending surface of the screenmold, just before it enters the ordinary stock in the vat, a mottlingstock composed of pulp combined with coloring material and water,

Patented hpnllmltnjlb.

which pulp is drawn closely against and v caused to adhere to the screenby the suction due to the partial vacuum within the screen. This coloredpulp accordingly forms a layer around the surface of the screen, whichthen takes up the secondary layer of ordinary stock in the usual way,two layers being thus combined and intermingling to form the web orsheet of paper, which is stripped from the cylinder and subjected to thefinishing operations in the usual way. As a result, a paper having a'mottled or variegated appearance is produced in a single, complete andcontinuous operation, at a cost exceeding, but little, if any, the costof making ordinary white or colored paper, and without the necessity ofpassing the paper through the machine a second time, the paper producedbeing also homogeneous throughout.

As shown in the present illustration, the mottling stock 5 consisting ofsuitably colored pulp and water, is supplied through a pipe 6 into aflow box or hopper divided into a series of compartments by partitions 8and 9. The partition 8 extends downward and terminates above the bottomof the box to provide a passage 10 which causes a down flow of thestock, which then travels upward and over the partition 9 whichterminates below the normal level of the stock in the box or hopper, thepulp then flowing downward between the partition 9 and a gate orcontroller 11, and through a discharge passage 12 between thebottom ofthe box and the lower edge of the gate and finally down an inclinedchute or flume 13, over which it flows and by which it is directed in athin film or stream against the surface of the forming roll 3. The chuteor flume 13 is arranged to apply the mottling stock to the screensurface of the roll 3 at a point just above the level of the ordinarystock 14 in the vat 2, on the descending side of the screen as itrevolves, and the amount of the mottling. stock which may be supplied,and the resulting thickness of the mottling layer, may be varied byregulating the depth of the passage 12 by adjusting the gate 11 throughthe medium of an adjusting screw or screws 15. The mottling stockapplied to the screen surface of the roll 3 is dra against the roll bythe suction w'ithin the roll, and is then carried by the rotation of theroll through the stock 14, the, pressure of the water keeping themottling stock against the surface of the screen, which takes up at thesame time an external layer of the stock l4, the operation then beingcarried out in the usual way as in the ordinary process of paper making.

It will thus be seen that by the process described a layerof mottlingstock is first deposited against the surface of the screen, Which iskept in contact therewith first by the suction within the screen andthereafter therefore possesses many advantages over ordinary mottled orvariegated paper, made of one thickness of ordinary stock, and adifferent thickness of mottled stock, as is the usual custom in making*such papers upon a cylinder machine. Furthermore, my improved processproduces a mottled or variegated paper at much less than the cost ofmanufacture of mottled papers prepared in the usual Ways.

I claim o 1. The process of making mottled or variegated paper upon acylinder machine,- which consists in depositing a layer of mottlingstock upon the surface of the screen, and

thereafter coating the screen with ordinary 3. The process of makingmottled or varie:

gated paper upon a cylinder machine, which consists in applying to the]unsubmerged portion'of the screen surface of the descending side of thecylinder mold a layer of mottling stock, varying the feed of themottling stockto regulate the thickness of the mottling.layer,revolvingthe screen through the vat to take up a layer of regular stocksuperposed upon the mottling stock, mingling said stocks, stripping thepaper thus formed from the cylinder mold, and then finishing the same inthe usual manner.

In testimony whereof I afiix my signature in presence of two witnesses,

JOHN F. HERCHER; Witnesses:

SILAS BULLARD, H. E. BULLARD.

